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Abstract

When errors occur on a read operation such as reading diskette files, retries are attempted until the record is recovered or the retry count is reached. If an error exists after the retry count has been reached, the error is considered hard and the record is unrecoverable. As illustrated in the drawing, a read verify operation is performed after the writing of data on diskette to validate the integrity of the data record and the cyclic redundancy check (CRC) bytes.

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United States

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English (United States)

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Error Correction as an Extension of Error Recovery on Information Strings

When errors occur on a read operation such as reading diskette files, retries
are attempted until the record is recovered or the retry count is reached. If an
error exists after the retry count has been reached, the error is considered hard
and the record is unrecoverable. As illustrated in the drawing, a read verify
operation is performed after the writing of data on diskette to validate the integrity
of the data record and the cyclic redundancy check (CRC) bytes.

The data which has been written is usually read at some later time during a
normal read operation. The data read is checked and if there is a data check,
conventional retries are attempted. If during a retry a successful read occurs, the
record is considered good. If all the retry attempts are unsuccessful, the error
correction extension operation is effected.

The error correction extension operation includes the reading of the data
record and CRC bytes and calculating a remainder. Successful read operations
result in a zero remainder, but since a data check had occurred, the remainder
probably will not be zero. The possibility of a zero remainder does exist, and
hence a check is made. A further requirement of the present error recovery
procedure is that the remainder be the same on three consecutive reads. This is
done because the characteristics of some diskette CRC errors are such that the
number of bits in error is not consis...